Estudo de processos erosivos superficiais em taludes do canal do sertão nas proximidades do Distrito Alto dos Coelhos Município de Água Branca – AL

• Autor(a) principal: Santos, Francisco José dos
• Data de Publicação: 2017
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal de Alagoas (UFAL)
• Texto Completo: http://www.repositorio.ufal.br/handle/riufal/4362
• topic: Engenharia civil; Erosão; Canal do Sertão; Água Branca - Alagoas; CNPQ::ENGENHARIAS::ENGENHARIA CIVIL::GEOTECNICA::MECANICAS DOS SOLOS

The present work refers to the study of the surface erosive processes and ravine formations in slopes of the sertão canal, evidencing the need of a constructive way of repair to protect the slopes and to control the loss soil particles. The development of erosive processes on slope surfaces increases ramp length by imparting high hydraulic energy to rainwater due to the conditions conferred by the action of the force of gravity. The water when it descends carries with it the different soil particles that have sandy characteristics with great granulometric variation, leaving visually unpleasant aspects, besides reducing the resistance of the slope to the shear. The surface of the slope is unprotected and conditioned to the progress of erosive processes, such as the appearance of furrows and ravines that can evolve to more severe erosive forms. According to the standard (NBR 11682/1991) slope stability, natural vegetation cover should be preferred on the site to ensure the protection of slopes, but field observations made in this work suggest that it was not sufficient to prevent landslides, especially at points of high ramp length and high slopes this was noted at several points along the channel in the Alto dos Coelhos-AL district. Due to the climatic characteristics of the region and the rare vegetation typical of the hinterland vegetation does not develop rapidly in dry seasons, which leaves these trees with little root distribution of their roots, almost in the foliage and little stability. During rainy periods from December 2015 to January 2016, high intensity rains occurred and the slope surfaces gave their first signs of degradation. The water from the rain finds a surface propitious to carry the material and consequently contribute to the formation of furrows and ravines. In some points of high slope of the slope it is noticed that there was the slip of soil together with the vegetation. The work was carried out with the purpose of evaluating the evolution of these processes over a period of 4 months, including the winter rainy season (saturation), from June to September 2016. Four ravines and two lateral ravines were analyzed. The ravines were centralized in relation to the lateral ones in the longitudinal direction of the sertão channel. The values of width, depth, extension and temperature were obtained for the central ravines. On the sides, laboratory tests were performed on the moisture content and the pH. An environmental impact analysis was carried out using a risk matrix and interaction networks.